Bob Lowry's books aren't sold at NSPF. They are sold at IPSSA and at his website. It is the CPO Manual that is sold at NSPF.
I've reviewed the NSPF manual and wrote up extensive comments on it in this post including a link to a detailed comments document I sent to Tom Lachocki the CEO of NSPF (whom I've met in person at an NEHA conference). The CPO manual is actually not that bad. On the other hand, Bob Lowry's books have more incorrect information, especially regarding the chlorine/CYA relationship, and I've written about that in this post and in this thread. I'm in contact with Bob Lowry these days so we may figure out a way to get his books updated in some way, but no I'm not planning on writing any such books myself.

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